Device for recording coded pulses

ABSTRACT

Device for recording coded pulses, in particular characters of a telegraphic code, comprising multivibrators corresponding to the units of the code to be identified, said multivibrators being connected to the outputs of a receiver, in particular a telegraphic code receiver, the change of state of a multivibrator causing the appearance of a polarity at one of the outputs of the device of sufficient duration to permit the control of a controlled circuit.

United States Patent [72] Inventor Roger Teurnier Rueil-Malmaison,France [21] Appl. No. 786,246

[22] Filed Dec. 23, 1968 [45] Patented June 15, 1971 [73] AssigneeC.I.'I.-Compagnie Industrielle Des Telecommunications Paris, France [32]Priority Dec. 22, 1967 I 33] France [54] DEVICE FOR RECORDING CODEDPULSES 9 Claims, 4 Drawing Figs.

{52] U.S. CI 178/23, 178/88,178/89 [51] Int. Cl H041 3/00 178/89, 93,

[50] Field of Search...

. l7.5,88,70;3l7/l39, 140

[56] References Cited UNITED STATES PATENTS 3,294,908 12/1966 Schiebeler178/88 3,359,368 12/1967 Kleinschmidt.... 178/89 Primary Examiner-Kathleen H. Claffy Assistant Examiner-Jon Bradford Leaheey A!t0rneyCraigand Antonelli ABSTRACT: Device for recording coded pulses, in particularcharacters of a telegraphic code, comprising multivibratorscorresponding to the units of the code to beidentified, saidmultivibrators being connected to the outputs of a receiver, inparticular a telegraphic code receiver, the change of state of amultivibrator causing the appearance of a polarity at one of the outputsof the device of sufficient duration to permit the control of acontrolled circuit.

DEVICE FOR RECORDING CODED PULSES The present invention concerns adevice for recording coded pulses, in particular characters of atelegraphic code.

In the telegraphic code receiver used in certain networks, orderscorresponding to the 5 moments or units or time intervals of the codeare given to memory circuits forming part ofa modulation recordingdevice. These orders are sent in the form of pulses of millisecondsduration for each negative unit or time interval and produce theengagement of highspeed relays of a small type. Such relays, which haveonly a very small number of contacts, are well suited for simplerecording of the modulation, but if it is desired to use them for morecomplicated needs, such as for example translation into decimal code, itis necessary to add to them auxiliary relays, resulting in a delay inthe operation and complication of the equipment.

It is the object of the present invention to effect the engagement ofrelays of normal type having a large number of contacts in a system ofthe type described. The invention also allows the selection of a certainnumber of predetermined combinations in a modulation for producing, forexample, a special operation.

The device according to the invention is more particularly characterizedin that, associated with a receiver and utilizing the orders whichappear at the outputs of the receiver, more particularly a telegraphiccode receiver, it comprises multivibrators corresponding to the units orcode time intervals to be identified and connected to the said outputsof the receiver such that the multivibrators are controlled successivelyaccording to the rate of the received moments, so that on reception of amoment of a certain polarity, there is no change of state of thecorresponding multivibrator, and such that on reception of a code unitof opposite polarity, there is effectively a change of state of themultivibrator, the change of state causing the appearance, at one of theoutputs of the device, of a polarity of sufficient duration to allow thecontrol of the circuit considered, for example of an electromechanicalrelay having a large number of contacts.

According to one feature of the invention, the device permitting bothrecording and selection of a combination of a code having 5 moments fromorders which appear at the receiver outputs comprises two monostablemultivibrators, six bistable multivibrators and a transitor.

According to yet another feature of the invention, the device comprisesn bistable multivibrators corresponding to n moments to be identifiedand twomonostable multivibrators, the first of which having a small timeconstant acts as a polarity distributor, while the second having a largetime constant corresponds to the time necessary for the control of thecircuit considered, each bistable multivibrator having its first inputat a point common to three circuits, the first circuit being connectedto the output of the polarity distributing multivibrator, the secondcircuit being connected to the test wire of the input moments, the thirdcircuit being connected to the first gate corresponding to the firstmoment, and its second input being connected to one of the gates of thereceiver, the device being such that during the time interval in whichthe first input does not receive any polarity from the differentcircuits, a capacitor is charged in the interior of the bistablemultivibrator, the capacitor being discharged and the multivibratorchanging its state as soon as the polarity returns to the first input,provided that a negative moment has been detected during the short timeinterval without polarity, left by the first monostable multivibrator,the multivibrator persisting in this state for a time sufficient toallow the engagement of an electromechanical relay having a large numberof contacts, and returning to rest only by the gate circuit connected toits second input, this arrangement being the same for the fourmultivibrators detecting the four first code units of the combination.

According to yet another feature of the invention, the duration of theappearance of a polarity on one of the outputs of the bistablemultivibrator of order n is limited by two instants, the first being theabsence of ground potential from the gate of n'th order at the firstinput of the bistable multivibrator and the second being the return ofearth polarity from the gate of (n+1) th order at the second input ofthe multivibrator, such that the total duration of the appearance ofpotential is equal to two code units.

According to yet another feature of the invention, the selec tion of apredetermined combination is effected by connecting one of the outputsof each bistable multivibrator, depending on the sign of the unit to beselected, to a common wire connected to the base of a transistor which,becoming thereby conductive, indicates that the selection of thepredetermined combination has just been operated.

According to yet another feature of the invention, the circuitry may besimplified if it is desired to register only one input combination, fivemonostable multivibrators only being then necessary.

Other features of the invention will appear in the course of thefollowing description of two embodiments of the invention given solelyby way of nonrestrictive example, the features resulting from bothdescription and drawings forming of course part of the invention. 7

FIG. 1 represents a selection and recording device according to theinvention.

FIG. 2 is a diagram of the times corresponding to the operation of thedevice according to FIG. 1.

FIG. 3 represents a simplified modification of the device according tothe invention.

FIG. 4 represents the diagram of the times corresponding to a secondmodification derived from FIG. 3.

In the embodiment shown in FIG. I, the telegraphic line LL is connectedto a receiver R of known type not shown in detail here. The receiver Rprovides a certain number of outputs: L PT, P0, P1, P2, P20, P3, P3a,P4, P4a, P4b, P5, P5a, PSand P6. The receiver R, of which only certainoutputs for the external orders appear, comprises, for example, ademultiplier formed of four binary multivibrators controlled by a I00c/s oscillator, the starting of which is caused by the appearance of anegative polarity on the line. From the start of this negative polarity,the line is tested at instants corresponding to the middle of each ofthe units of a character; the result of this test appears at one of theoutputs and persists until a fresh test detects a change of polarity.The other outputs of the receiver are gates connected to ground exceptduring. certain welldetermined time intervals successively for thedifferent gates, each time interval having the duration of a unitreckoned between the middles of two successive units.

From the start of a negative line pulse, the line is tested at theinstants of 10, 30, 50, 70, 90, and I30 milliseconds, corresponding tothe middles of the different units of code (FIG. 2). The result of thetest appears at the output L as a ground potential for a positive linepulse and as nothing for a negative line pulse. The situation of thepoint L persists until a new test detects a change of the line polarity.The other outputs of the receiver are all gates shown symbolically by adiode, the state of which, independent of the input modulation, is shownrespectively by the curves b, d, e,f, g, h,j and k of FIG. 2. The curvea represents the division of a character; the latter is formed of anegative start ST, five significant code units I, 2, 3, 4 and 5, whichmay be positive or negative, and a stop SP always positive. All themoments have a duration of 20 milliseconds, except the stop, which has aduration of 30 milliseconds. The cycle CR of the receiver R has aduration of milliseconds and commences at the commencement of the start.

The device according to the invention comprises two monostablemultivibrators MMl and MM2, both having the same internal circuit ofknown type, shown in detail in the case of the multivibrator MM2, andsix bistable multivibrators MB] to MB6 having all the same knowninternal circuit shown in detail MB]. In addition there is a transistorT, the output of which is represented by its collector.

The input E1 of the multivibrator MMl is connected to the gate PT which,according to the diagram b (FIG. 2), is either at ground potential for10 milliseconds (top line) or at nothing (bottom line); there results atthe output S1 of the multivibrator MMl, a quasi-permanent groundpotential interrupted only for about 250 microseconds at the instantsIO, 30, 50, 70, 90 and 110 milliseconds (curve c, FIG. 2).

The diagrams d toj in FIG. 2 give the negative polarities applied to thegates P to Pb of the receiver R. The negative polarity is applied inturn to the gates for 20 milliseconds: from the instant to the instant30 to gate P0 (curve 11), from the instant 30 to the instant 50 to gateP1 (curve e), from the instant 50 to the instant 70 to gates P2 and P2a(curvef), from the instant 70 to the instant 90 to gates P3 and P3a(curve g), from the instant 90 to the instant 1 10 to gates P4 and P40,P4b (curve h), from the instant 1 10 to the instant 130 to gates P5,P50, P5b (curvej).

The output L of the receiver R is connected to the output S1 of themultivibrator MMl across a diode dL, and the common point A thus formedis connected in its turn across diodes d1 to 115 to each of the inputsE1 of the multivibrators MB1 to MBS. In addition, the gate P1 isconnected to the input E1 of the multivibrator MB1, the gate P2 isconnected to the input E1 of the multivibrator MB2, the gate P3 isconnected to the input E1 of the multivibrator MB3, etc. The result isthat the state of the input E1 of the multivibrator MB1 depends on thesimultaneous state of the output S1 of the multivibrator MM1,

the output L and the gate P1; similarly for the inputs E of themultivibrators MB2 to MBS. The output B1 of each of the multivibratorsMB1 to M85 is connected across a resistance R1 to a common point B,itself connected on the one hand to the negative polarity of a source ofcurrent across a resistance R2 and on the other hand to the gate P0. Theoutputs S0 of the multivibrators MB1 to MBS form respectively theoutputs l, 2, 3, 4 and 5 to a recording device DE. The input E0 of themultivibrator MB1 is connected to the gate P2a, the input E0 of themultivibrator MB2 is connected to the gate P30, the input E0 of themultivibrator MB3 is connected to the gate P40, the input E0 of themultivibrator M85 is connected across a diode to the output S1 of themultivibrator MM2, the input of the latter being connected to the gateP4b.

The operation of the device just described is as follows:

Reception ofa code combination will be assumed; at the instant 0 themultivibrators MB1 to MB5 are in the condition of providing groundpotential at the outputs SI. On the appearances of a line start(negative) the receiver R is started, ground potential disappears fromthe output L; however, there is no practical effect, since groundpotential continues to be provided at the outputs S1 of themultivibrator MMI and by the gates P1 to P5. 1'

At the instant l0, triggering of the multivibrator MM1 suppresses for250 as the ground potential at the output S1; however, again nopractical effect results, since ground potential continues to be provideby the gates P1 to P5.

At the instant 30, middle of the first code unit, triggering of themultivibrator MMl (no ground potential at the output S1 for 250 ps)coincides with the suppression of ground potential at the gate P1.However, if the unit tested is positive, there is ground potential atthe output L and consequently no practical effect results, groundpotential continuing to be applied to the input E1 to each multivibratorMB1 to M135; but if the unit tested is negative, there is no longerground potential at the input E1 of the multivibrator MB1 from gate P1or outputs S1 and L and the capacitor C1 is charged between the negativepolarity of the collector of the transistor T82 and the base of thetransistor T81 When the ground potential from the output S1 of themultivibrator MM] reappears at the input E1 of the multivibrator MB1,the latter changes state, the transistor which was conductive is blockedand the transistor T82 which was blocked becomes conductive. The groundpotential thus disappears from the output S1 to appear at the output S0.

At the instant 50 (middle of the second moment), ground potential isgiven again by the gate P1 to the input E1 of the multivibrator MB1; theground potential is suppressed for 250 microseconds at the output S1 ofthe multivibrator MMI. There is, therefore, no effect on themultivibrator MB1, but on the contrary there is at the input E1 of themultivibrator MB2 an operation identical with that just seen for theinstant 30 at the input E1 of the multivibrator MB1. Therefore, if thecode unit tested is negative, the multivibrator M82 changes state; theground potential disappears from the output S1 of the multivibrator MB2.However, the ground applied by the gate P241 to the input E0 of themultivibrator MB1 has disappeared at the same time as the groundpotential applied by the gate P2 to the input E1 of the multivibrator(see curvef, FIG. 2); consequently, the capacitor C2 of themultivibrator MB is charged between the negative polarity of the outputS1 and the base of the transistor TB2.

This state is maintained until the instant 70. At the instant 70, aground potential is reapplied by the gate PM to the input E0 of themultivibrator MB1 which produces a change of state of the multivibratorMB1; the ground which was at the output S0 is suppressed and is restoredat the output S1.

From what has just been seen, it is possible to deduce that a positiveunit does not apply ground potential to the output S0 of themultivibrator MB1, whereas a negative unit applies ground to the outputS0 for 40 milliseconds (see curve m, FIG. 2). It should be noted thatthe multivibrator MB1 had made its first change of state only at theinstant 30 ms. 250 #s; the duration of ground potential at the output S0is therefore actually slightly less than 40 ms. The outputs S0 thereforepermit the engagement of ordinary relays having several contacts; theserelays being situated in the recording device DE and being capable ofhaving a holding winding reflect the polarity of the different units ofa character, an engaged relay corresponding to a negative unit and arelay at rest to a positive unit.

The operation is identical for the units 2, 3 and 4 corresponding to themultivibrators M82, M83 and M84. With regard to the multivibrator MB5,the operation is quite analogous to that of the multivibrator MB1 forthe first change of state obtained by the input E1. For the secondchange of state obtained by the input E0, the operation is different,because there are no longer any gates such as P211, P3a, P4a, PSaconnected to the respective inputs of the multivibrators MB1 to MB4,since the cycle CR of the receiver terminates at milliseconds. Theground potential of the gate P4b is maintained at the input E1 of themultivibrator MM2 up to the instant 90 (see curve h, FIG. 2). At thisinstant, suppression of ground potential permits charging of thecapacitor C3. At the instant 110, when ground returns via the gate P4b,there is a change of state of the multivibrator MM2 that is to say,ground potential S1 of the multivibrator MM2 is suppressed and groundpotential appears at the output S0 of the multivibrator MM2 (curvef,FIG. 2). For 40 milliseconds, corresponding to the time constant of themultivibrator MM2, the input E0 of the multivibrator MB5 no longerreceives ground potential. After this time, that is to say at theinstant ms., the multivibrator MM2 again changes state; ground potentialis restored to the output S1 of the multivibrator MM2 an suppressed atthe output S0. The input E0 of the multivibrator MB5, again receivingground potential, produces the change of state of the multivibrator MBSwhich returns to the resting position.

When several characters have to be recorded, it is necessary to have adistributor synchronized with the operation of the receiver; thissynchronization may be obtained by means of a circuit identical withthat controlling the multivibrator MBS but not connected to L since itdoes not depend on the nature of the input units.

The circuit according to FIG. 1 also permits selection of certaincombinations of a telegraphic modulation. For this purpose, it is merelynecessary to provide the circuits shown in dashed lines and to connectground to the wire N; the latter is connected to all the inputs E0 ofthe multivibrators MB1 to MBS which are then kept constantly at groundlever. Each multivibrator MB! to MBS having changed state by its inputEI can no longer revert to rest by its input E at the end of 40milliseconds.

For selecting a given combination comprising, for example, positiveunits and negative units, it is merely necessary to connect, acrossdiodes D1 to D5, to a common wire the outputs S0 or $1 of the fivemultivibrators MBI to MBS; for a positive unit of order n1 the commonwire is connected to the output S0 of the multivibrator of order ncorresponding to the said unit, and for a negative unit the common wireis connected to the output S1. The common wire is connected to the baseofa type PNP transistor, the base being negatively biased at rest; underthese conditions the transistor is conductive only if no groundpotential arrives at the common wire, which is the case for the selectedcombination. It will be assumed, for example, that it is desired todetect the sign combination (often used as the end of a numberingsignal); this combination being following: will correspond to a commonwire connected to S0 ofMBl, Sl ofMBZ, S1ofMB3, SI ofMB4 and S0 of MBS asindicated in FIG. 1. When this combination is received by themultivibrators MBl to MBS, the ground potentials from the outputs S0 andS1 appear at the outputs opposite to those connected to the common wire:there is, therefore, no ground potential on the common wire for theselected combination and consequently the transistor T could becomeconductive. However, the common wire is also connected across the diodeD6 to the output 81 of a bistable multivibrator MB6, the operation ofwhich is analogous to that of the multivibrator MBI; there is,therefore, ground potential at the output S1 of the multivibrator M86owing to the gate P5b up to the instant 130 ms.

From the instant 130 ms., therefore, the transistor T becomesconductive. Ground potential at the output S1 of the multivibrator MB6will only reappear at the instant 10 of the next cycle by the gate P6(curve k, FIG. 2). Therefore, for two consecutive combinationstransmitted in the 150 ms. cycle, interruption of ground potential atthe output S1 of the multivibrator MB6, during which the transistor T isconductive, is at least equal to 40 ms. The order given to the collectorof the transistor T, therefore, indicates that the combination which hadto be selected has just been received by the receiver R.

According to requirements, any code combination may be selected by thesame process as that just described for the combination. Between theinstants l0 and of each cycle, that is to say, before recording of thefirst moment, the multivibrators are put in the resting position by P0.

The curves m to q of FIG. 2 give the change of state of the fivemultivibrators MBI to MBS in the course of one cycle. It will be seenthat earth polarity is applied in turn to the outputs S0 with adisplacement of 250 microseconds relative to the middle of each of thefive units and that there remains approximately milliseconds, providedthe units are negative. The return to rest of the entire device isensured before the reception of the next character by the circuitconnecting the point B to the input B1 of each multivibrator, theresistance R2 not being short-circuited by the gate P0 between theinstants l0 and 30.

Modification I When the selection of certain code combinations is notcontemplated, a simpler circuit according to that of FIG. 3 may be used.

In this case, the bistable multivibrators MBl to MBS are replaced bymonostable multivibrators M1 to M5, the unstable period of which isselected in accordance with the recording circuit to be controlled (40milliseconds, for example), and only the monostable multivibrator MMl isretained. The outputs of the receiver R are limited to L, PT, P1, P2,P3, P4 and PS, the line arriving at L.

The circuits applied to the inputs E1 of the different multivibrators M1to M5 are exactly the same as in FIG. I for application to the inputs ofthe multivibrators MBI to MES.

Here, only the outputs S0 are connected to the recording devices DE, theoutputs Sl are not used; the gate PT and the output S1 of themultivibrator MMl provide the same signals as in the preceding case(curves b and c, FIG. 2); likewise, the gates P1 to P5 also operate aspreviously described (curves e to j, FIG. 2).

At the input E1 of the multivibrator M1, at the instant 30 ms. andduring 250 microseconds, ground potential is found if the first unit ispositive and nothing if the first unit is negative. In this latter case,the multivibrator MI is triggered and a ground potential appears for 40milliseconds at the output S0 of the multivibrator M1.

The periods of operation of the multivibrators M1 to M5 are the same asthose indicated in the diagram (curves m to q, FIG. 2) for themultivibrators MBl to MB5.

Modification 2 The circuit may be simplified still further byeliminating the multivibrator MM]; The gate PT is also eliminated andinput E1 is subjected only to two conditions carried into effect by thewire L and the wire of the corresponding gate. Thus, the

input E1 of the multivibrator M1 is connected to the wire L and to thegate P1, the input E1 of the multivibrator M2 is connected to the wire Land to the gate P2, etc,

When ground potential is suppressed at the gate Pl, the capacitor of M1(such as C3 of MM2, FIG. 1) is charged, but the change of state(unstable period) only takes place during the discharge of the capacitorcaused by the reappearance of ground potential at the gate Pl at instant30.

The change of state, therefore, occurs with a delay of 20 as comparedwith the circuits according to FIGS. 1 and 3. The waveform diagramsrelating to the modification 2 are illustrated in FIG. 4, references rto v corresponding to the multivibrators M1 to M5.

It will be noted that the multivibrator M5 remains in the triggeredstate for 20 ms. after the instant (end of signal); this is of noimportance for the reception, since the multivibrator M1 will betriggered in the following cycle only at the instant 50.

It will obviously remain within the scope of the invention if the latteris extended to the detection and recording of a code having more or lessthan 5 moments, or by the use of transistors of a type opposite to thatdescribed herein or by the reversal of the polarities which have beengiven at the gates and outputs of the receiver or generally by the useof means equivalent to those which have been specified.

Iclaim:

l. Coded pulse recording device associated with a telegraphic codereceiver, having means responsive to a predetermined input codecombination and permitting the recording of any code combination onelectromechanical relays having a large number of contacts,characterized in that the device, utilizing signals appearing at theoutputs of the receiver, comprises multivibrators corresponding to thecode time intervals to be identified and connected to the said outputsof the receiver such that the multivibrators are controlled successivelyaccording to the rate of the code time intervals received in a mannersuch that on reception ofa code time interval of a certain polaritythere is no change of state of the corresponding multivibrator, and suchthat on the reception of a code time interval of opposite polarity,there is a change of state of said multivibrator, the change of statecausing the appearance of a polarity signal at one of the outputs of thedevice of sufficient duration to permit the control of anelectromechanical relay having a great number of contacts, and thedisappearance of the polarity being caused by a change of state of themultivibrator.

2. Device according to claim 1 and further including control meansconnected to each multivibrator for permitting a change in state thereofonly at the center of a respective code time interval.

3. Device according to claim 2 wherein said control means includes amonostable multivibrator, said receiver providing a second output havinga frequency equal to twice the frequency of the received code timeintervals connected to said monostable multivibrator in control thereof,said monostable multivibrator having a very short conduction time.

4. Coded pulse recording device for the recording of any codecombination having n code units from a telegraphic code receiverincluding demultiplier means for polarity testing the different codeunits of the combination and a plurality of gates rendered successivelyconductive at definite instants, comprising n bistable multivibratorscorresponding respectively to the n code units to be identified andfirst and second monostable multivibrators, said first monostablemultivibrators having a small time constant and serving as a polaritydistributor. said second monostable multivibrator having a large timeconstant, providing a signal having a duration which corresponds to thetime necessary for the control of the circuit considered, each bistablemultivibrator having a first input connected to a point common to threecircuits, the first circuit connecting the bistable multivibrator to theoutput of the polarity distributing multivibrator, the second circuitconnecting the bistable multivibrator to the output of said demultipliermeans, and the third circuit connecting the bistable multivibrator to agate corresponding to the respective code units associated with thegiven bistable multivibrator, and its second input being connected to afirst gate of the receiver which initially resets the multivibrator eachbistable multivibrator including a capacitor which charges during a timeinterval in which the first input received no polarity signal from saidthree circuits, said capacitor being discharged and the multivibratorchanging state in response to return of the polarity signal to the firstinput along with detection of a negative code units during the timeinterval when no polarity signal is provided by the first monostablemultivibrator, a bistable multivibrator persisting in this state for atime sufficient to permit the engagement of an electromechanical relayhaving a large number of contacts, and only returning to rest inresponse to control provided by the gate circuit connected to its secondinput, this arrangement being the same for the n-l multivibratorsdetecting the first n-l code units of the combination,

5. Device according to claim 4, characterized in that, for the detectionof the nth code unit of the combination, it comprises an additionalbistable multivibrator identical with the bistable multivibratorsdetecting the n-l code units, but in which the second input of the nthmultivibrator is connected to the first output of the second monostablemultivibrator having a large time constant, the latter multivibratorhaving changed state at the same time that the nth bistablemultivibrator made its first change of state, and the return to rest ofthe second monostable multivibrator causing the return to rest of thenth bistable multivibrator.

6. Device according to claim 4, characterized in that the three circuitsconnected to the first input of each bistable multivibrator are suchthat the first circuit serves as means for providing a shortinterruption of positive polarity in the middie of each input code unit,the second circuit serves as a means for providing a given polarity on atest of positive code unit only and the third circuit connected to theoutput of the gate corresponding to the moment explored provides apermanent positive polarity except during the period corresponding tothe time interval separating the middles of two consecutive code units,that the first input of each bistable multivibrator does not receive anypolarity during said short interruption if the explored moment isnegative, and continues to receive a positive polarity if the code unitexplored is positive.

7. Device according to claim 1, characterized in that the selection ofany predetermined code combination having five code time intervals isobtained by a device comprising five bistable multivibrators and inaddition a sixth bistable multivibrator and a transistor, the base ofwhich is connected to a common wire, to which are connected the outputsof the five bistable multivibrators, means for applying a blockinpolarity signal to the second input of the five multivibrators ormaintaining them in their first change of state condition and to theoutput of the sixth bistable multivibrator, such that no blockingpolarity signal arrives at the transistor when it is a matter of thecode combination selected from the last received instant and during atleast 30 milliseconds.

8. Coded pulse recording device for recording of a telegraphic codecombination of code units from a telegraphic code receiver includingdemultiplier means for a polarity testing the different code units ofthe the combination and a plurality of gates rendered successivelyconductive at definite instants, comprising five monostablemultivibrators, the unstable period of which is selected according tothe recording circuit to be controlled, and another monostablemultivibrator having a small time constant and acting as polaritydistributor, each monostable multivibrator having its input connected tothe common point of three circuits: the first circuit connecting thecommon point to the output of the multivibrator acting as distributor,the second circuit connecting the common point to said demultipliermeans, and the third circuit connecting the common point to a first gatecorresponding to the first code time interval, the device being suchthat at the middle of the first code time interval explored no polaritysignal is applied to the input of the monostable multivibrator during atime interval sufficient to produce its triggering provided the momentreceived is negative, the multivibrator not triggering if the first codetime interval is positive, triggering of the multivibrator causing apolarity signal to appear at its output for a time sufficient to permitthe control of the circuit and all the multivibrators triggeringsuccessively at the commencement of the explored moment if the said codetime interval is negative.

9. Coded pulse recording device for recording of a telegraphic codecombination of code time intervals from a telegraphic code receiverincluding demultiplier means for polarity testing the different codetime intervals of the combination and a plurality of gates renderedsuccessively conductive at definite instants, comprising five monostablemultivibrators, the unstable period of which is selected according tothe recording circuit to be controlled, each monostable multivibratorhaving its input connected to the common point of two circuits; thefirst circuit connecting the common point to said demultiplier means,and the second circuit connecting the common point to a first gatecorresponding to the first code time interval, triggering themultivibrator taking place only after the lapse of a time interval inthe absence of a polarity signal given by the gate connected thereto,reappearance of the polarity signal at the gate causing the triggeringof the multivibrator provided the tested moment is negative and all themultivibrators triggering thus successively at the instant at which apolarity signal reappears at the gate to which they are connected,provided the code time interval explored is negative, the triggeringtime being sufficient to permit the control of the circuit considered.

1. Coded pulse recording device associated with a telegraphic codereceiver, having means responsive to a predetermined input codecombination and permitting the recording of any code combination onelectromechanical relays having a large number of contacts,characterized in that the device, utilizing signals appearing at theoutputs of the receiver, comprises multivibrators corresponding to thecode time intervals to be identified and connected to the said outputsof the receiver such that the multivibrators are controlled successivelyaccording to the rate of the code time intervals received in a mannersuch that on reception of a code time interval of a certain polaritythere is no change of state of the corresponding multivibrator, and suchthat on the reception of a code time interval of opposite polarity,there is a change of state of said multivibrator, the change of statecausing the appearance of a polarity signal at one of the outputs of thedevice of sufficient duration to permit the control of anelectromechanical relay having a great number of contacts, and thedisappearance of the polarity being caused by a change of state of themultivibrator.
 2. Device according to claim 1 and further includingcontrol means connected to each multivibrator for permitting a change instate thereof only at the center of a respective code time interval. 3.Device according to claim 2 wherein said control means includes amonostable multivibrator, said receiver providing a second output havinga frequency equal to twice the frequency of the received code timeintervals connected to said monostable multivibrator in control thereof,said monostable multivibrator having a very short conduction time. 4.Coded pulse recording device for the recording of any code combinationhaving n code units from a telegraphic code receiver includingdemultiplier means for polarity testing the different code units of thecombination and a plurality of gates rendered successively conductive atdefinite instants, comprising n bistable multivibrators correspondingrespectively to the n code units to be identified aNd first and secondmonostable multivibrators, said first monostable multivibrators having asmall time constant and serving as a polarity distributor, said secondmonostable multivibrator having a large time constant, providing asignal having a duration which corresponds to the time necessary for thecontrol of the circuit considered, each bistable multivibrator having afirst input connected to a point common to three circuits, the firstcircuit connecting the bistable multivibrator to the output of thepolarity distributing multivibrator, the second circuit connecting thebistable multivibrator to the output of said demultiplier means, and thethird circuit connecting the bistable multivibrator to a gatecorresponding to the respective code units associated with the givenbistable multivibrator, and its second input being connected to a firstgate of the receiver which initially resets the multivibrator eachbistable multivibrator including a capacitor which charges during a timeinterval in which the first input received no polarity signal from saidthree circuits, said capacitor being discharged and the multivibratorchanging state in response to return of the polarity signal to the firstinput along with detection of a negative code units during the timeinterval when no polarity signal is provided by the first monostablemultivibrator, a bistable multivibrator persisting in this state for atime sufficient to permit the engagement of an electromechanical relayhaving a large number of contacts, and only returning to rest inresponse to control provided by the gate circuit connected to its secondinput, this arrangement being the same for the n-1 multivibratorsdetecting the first n-1 code units of the combination.
 5. Deviceaccording to claim 4, characterized in that, for the detection of thenth code unit of the combination, it comprises an additional bistablemultivibrator identical with the bistable multivibrators detecting then-1 code units, but in which the second input of the nth multivibratoris connected to the first output of the second monostable multivibratorhaving a large time constant, the latter multivibrator having changedstate at the same time that the nth bistable multivibrator made itsfirst change of state, and the return to rest of the second monostablemultivibrator causing the return to rest of the nth bistablemultivibrator.
 6. Device according to claim 4, characterized in that thethree circuits connected to the first input of each bistablemultivibrator are such that the first circuit serves as means forproviding a short interruption of positive polarity in the middle ofeach input code unit, the second circuit serves as a means for providinga given polarity on a test of positive code unit only and the thirdcircuit connected to the output of the gate corresponding to the momentexplored provides a permanent positive polarity except during the periodcorresponding to the time interval separating the middles of twoconsecutive code units, that the first input of each bistablemultivibrator does not receive any polarity during said shortinterruption if the explored moment is negative, and continues toreceive a positive polarity if the code unit explored is positive. 7.Device according to claim 1, characterized in that the selection of anypredetermined code combination having five code time intervals isobtained by a device comprising five bistable multivibrators and inaddition a sixth bistable multivibrator and a transistor, the base ofwhich is connected to a common wire, to which are connected the outputsof the five bistable multivibrators, means for applying a blockingpolarity signal to the second input of the five multivibrators formaintaining them in their first change of state condition and to theoutput of the sixth bistable multivibrator, such that no blockingpolarity signal arrives at the transistor when it is a matter of thecode combination selected frOm the last received instant and during atleast 30 milliseconds.
 8. Coded pulse recording device for recording ofa telegraphic code combination of code units from a telegraphic codereceiver including demultiplier means for a polarity testing thedifferent code units of the the combination and a plurality of gatesrendered successively conductive at definite instants, comprising fivemonostable multivibrators, the unstable period of which is selectedaccording to the recording circuit to be controlled, and anothermonostable multivibrator having a small time constant and acting aspolarity distributor, each monostable multivibrator having its inputconnected to the common point of three circuits: the first circuitconnecting the common point to the output of the multivibrator acting asdistributor, the second circuit connecting the common point to saiddemultiplier means, and the third circuit connecting the common point toa first gate corresponding to the first code time interval, the devicebeing such that at the middle of the first code time interval exploredno polarity signal is applied to the input of the monostablemultivibrator during a time interval sufficient to produce itstriggering provided the moment received is negative, the multivibratornot triggering if the first code time interval is positive, triggeringof the multivibrator causing a polarity signal to appear at its outputfor a time sufficient to permit the control of the circuit and all themultivibrators triggering successively at the commencement of theexplored moment if the said code time interval is negative.
 9. Codedpulse recording device for recording of a telegraphic code combinationof code time intervals from a telegraphic code receiver includingdemultiplier means for polarity testing the different code timeintervals of the combination and a plurality of gates renderedsuccessively conductive at definite instants, comprising five monostablemultivibrators, the unstable period of which is selected according tothe recording circuit to be controlled, each monostable multivibratorhaving its input connected to the common point of two circuits; thefirst circuit connecting the common point to said demultiplier means,and the second circuit connecting the common point to a first gatecorresponding to the first code time interval, triggering themultivibrator taking place only after the lapse of a time interval inthe absence of a polarity signal given by the gate connected thereto,reappearance of the polarity signal at the gate causing the triggeringof the multivibrator provided the tested moment is negative and all themultivibrators triggering thus successively at the instant at which apolarity signal reappears at the gate to which they are connected,provided the code time interval explored is negative, the triggeringtime being sufficient to permit the control of the circuit considered.